Chevrolet Repair: s-10 wiring, throttlebody, fuel pump

Question
i have a 1992 s-10.it had a 2.8 from the factory and it blowed up . i bought a 1993 s-10 blazer with a 4.3. i pulled the 4.3 out to put it in the truck.the blazer sat in the woods for 5 years totaled out in the rear. i tried to crank it up before i bought it and no gas would come through the throttlebody but you could pour gas in the throttlebody and it would run good until it ran out of gas. i never heard the fuelpump kick on so i thought that was the problem so i put it in the truck and got the same problem but the fuelpump is working in the truck. you can run a hot and a ground off the battery to the top of the injectors and it will work but it will flood. is the ecm or wiring bad

Answer
Answering this question from a similiar problem found during an engine swap in a Toyota!!
The fuel pump that was in your old truck will most likely have different operating pressures than what your larger engine needs.
Consider this:
At idle, your fuel pump will recieve a certain amount of current.
Under a load, it will recieve a different amount of current.
Look up the specifications of current for the older truck and compare them to the newer truck.
Also , compare the operating pressures and compare them to each other.
From there, you should be able to figure out how to correct the problem.